ASP中的判断语句不起作用

为何我的判断语句不起作用呢?就是在数据库中没有图片时也不会显示那句"数据库中没有图片",请高手指点!谢谢!源代码如下:<%

google_ad_width = 250; google_ad_height = 250; google_ad_format = "250x250_as"; google_color_url = "000000";

set connGraph=server.CreateObject("ADODB.connection")

connGraph.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & server.mappath("images.mdb") & "; Jet OLEDB:Database

Password=; Persist Security Info=False;"

set rec=server.createobject("ADODB.recordset")

strsql="select img from images where imgID=" & trim(request("imgID"))

rec.open strsql,connGraph,1,1

if not rec.eof then

Response.ContentType = "image/*"

picsize=rec("img").ActualSize

Response.BinaryWrite rec("img").getChunk(picsize)

rec.close

else

response.write "数据库中没有图片!"

end if

set rec=nothing

set connGraph=nothing

%>